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Color is created by our brains. When two different wavelengths of light overlap, we do not see two overlapping wavelengths of light, or two distinct colors, we see one color with no definitive wavelength created by our brains. This indicates many different things. This identifies how creative and complex the abilities of the brain are. The brain can create images that do not exist in reality completely independent of our "I" function.

This probably happened for evolutionary purposes but how applicable and useful is it to us now? We don't need to run from tigers and lions in order to survive anymore, or most of us don't at least... Can we trust our own brain to have functions that are necessary for survival now or are the mysterious functions of our brain stuck in an environment in the past? Has our society involved much quicker than the brain? The battles we face for survival today are cancers and diseases in the brain. Is our brain in the midst of evolving functions to treat these problems? 

 On another note, I think it is interesting that we constructed the notions of what is normal and able in our society on what was normal to the majority of us. Those who do not exhibit the same capabilities as the majority are disabled. But when they are in the likes of everyone who shares the same level of abilities they are what is normal. Our brain has a capacity to be creative and this capacity makes me wonder if in some future far away  we may keep evolving, and our general physical characteristics, the senses and abilities we have today, etc. might be considered a disability then just like a caveman might be considered abnormal to us now.